About 9.6% of the prime jumbo mortgages in securitizations were at least 60 days past due in January, up from 9.2% in December, the 32nd straight increase in "serious delinquencies," according to Fitch Inc.

"The trend line for delinquencies indicates the 10% level could be reached as early as next month," Vincent Barberio, a Fitch managing director, said in a press release issued Monday. The rate almost tripled in 2009, Fitch said.

Subscribe Now

Access to authoritative analysis and perspective and our data-driven report series.

14-Day Free Trial

No credit card required. Complete access to articles, breaking news and industry data.